Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

1 Answer

Door wont close all the way

The garage door closes to about 6" from the floor then reverses. If i put a little pressure on the motion it closes okay. I looks like it needs more downward pressure

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  • jasonbuffing Dec 27, 2008

    I have the exact same problem

  • doug1956 Dec 28, 2008

    I have a Chamberlain garage door opener in which the closer shuttle goes half way down the track and stops. It does not reverse, just stops so the door remains half closed. I have adjusted the open and close force knobs and no change. What could be wrong?

  • doug1956 May 11, 2010

    I have adjusted the down force all the way from low to high...no change.

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  • 4 Answers

Try adjusting the down force, Turn screw an eight of an inch.

Posted on Dec 16, 2008

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1 Answer

Why is my garage door suddenly reversing when going down?


Deb, that reversal is a child safety device - if the bottom edge of the door detects contact with any object, it'll immediately reverse so it doesn't kill a child. Or a cat, dog, whatever.

The opener mechanism should have a stop switch that prevents the door from closing hard against the floor - that stop switch needs to be adjusted so that the door will stop JUST before hard contact. That'll take care of it "bouncing" off the floor & reversing. As to it reversing before it touches the floor... examine both guide rails closely to see if there's any obstruction that the door's bottom edge may be contacting to trigger the child protection reversal switch.

Aug 04, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 3/4 horsepower liftmaster garage door opener, both the remote and the wall button won't close the garage door but both will open the garage door. however, the garage door will close if I hold...


If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.

Sep 26, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I can not close my my Chamberlain garage door. It tries to close, and reach the end, then somehow after a second pause it opens. sometimes, wait for 5 minutes, it closes normally. This happens only when...


It sounds like the door is closing just a little too far. It hits the garage floor and the safety reverses it to the open position. This can be intermittent. On the side of the motor unit you will find the 'down limit' adjustment. Turn this just a tad in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary to get it just right.

Jul 06, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

The garage door closes and then opens up again, I have to close it several times before it secures. There are no obstructions. Is this a sensitivity problem?


More than one thing can cause this type problem.

If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is not flickering ever so slightly.

If the door reverses when it hits the floor it is a sign that the door is traveling a bit to far. The adjustment for this is on the side of the motor unit. Turn the 'down limit' in the opposite direction of the arrow printed on the cover. Some tweaking will probably be necessary.

Jul 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door would not close all the way


DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

Jan 19, 2010 | Chamberlain 1/2-HP Whisper Drive Belt...

2 Answers

Garage door wont close all the way


The over-force limit is probably being activated. YOu may have a spot on the track that is putting load on the closer. Try MANUALLY moving the door to verify easy motion through complete range.

ALSO verify you don't have a cord that hangs down and triggers the electric eye safety devices. A pull cord can do this but usually the door is reversed when that happens.

You may also need to INCREASE the tension limit on the head if you find the tracks and counter balance springs have no problem.

Sep 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

GARAGE DOOR CLOSES TO THE FLOOR AND OPENS ALL THE


If the garage door is hitting the floor and reversing to the open position you need to adjust the 'down limit' which is on the side of the motor unit. Turn it in the opposite direction of the arrow printed on the cover. A little tweaking should get it just right.

Aug 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not close at the bottom


could be the safety "eyes" as suggested (based on the "does not go back down"), but there are also 2 adjustments on the opener. One is to tell it where the floor is, and the other is to tell it how much pressure to reverse at. I would try adjusting the "floor". Since it's hitting the floor and coming back up, that's probably your problem.

Dec 27, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My garage door will not stay down when I try to close it.


IF THE DOOR CLOSES ALL THE WAY WHEN HOLDING DOWN THE WALL BUTTON AND REVERSES 6" FROM THE FLOOR WHEN NOT HOLDING THE BUTTON.
I WOULD GUESS THAT THE SAFETY EYES ARE MOUNTED ON THE TRACK.
WHEN THE DOOR CLOSES THE TRACK AT THE BOTTOM IS TOO TIGHT CAUSING IT TO FLEX AS THE DOOR GETS NEAR THE BOTTOM. WHEN THE TRACK FLEXES THE EYES ARE POINTING FURTHER AWAY FROM THE DOOR AND EVENTUALLY THEY ARE TOO FAR OUT OF ALINMENT AND THE LED WILL GO OFF - THE DOOR GOES BACK UP.

SOLUTION: YOU CAN USE THE CLAW END OF A HAMMER TO TAP THE TRACK OUT A LITTLE WIDER - TAP NEXT TO THE WALL ON THE BRACKET THAT HOLDS THE TRACK TO THE WALL. MOVE THEM ABOUT 1/4" EACH SIDE.

OR

YOU CAN MOUNT THE BRACKETS TO THE WALL OR THE FLOOR.

THIS SHOULD SOLVE IT

HAVE A GREAT DAY

Dec 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

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